Improvement of marine carbon capture onboard diesel fueled ships

[Display omitted] There is an urgent need to reduce the CO2 emissions from global shipping. This study developed efficient sea-based CO2 capture, CO2 compression and liquefaction for a 3000 kW diesel engine. Several mixed solvents, an intercooler and multiple feeds are used to improve CO2 removal in the absorber. A square-shape is adopted to reduce space, which is in scarce supply in marine applications. Heat integration is applied to enhance the performance of the stripper. An effective configuration is developed for marine CO2 capture to improve the absorber, stripper, CO2 compression and liquefaction. Mono-ethanolamine/piperazine (MEA/PZ) and N-methyl-diethanolamine (MDEA)/PZ increases by 1.7% and 2.8% in terms of CO2 removal compared to the MEA solution, respectively. The MDEA/PZ process with the intercooler and MDEA/PZ process with multiple feeds achieve 90.6% and 90.5% CO2 removal, respectively. The configuration using MDEA/PZ as a solvent, and the combined use of the intercooler, multiple feeds and heat integration demonstrate advantages for ship-based carbon capture. The CO2 removal for the final configuration is 1348 kg/h (94.7%); this is an 8.4% increase compared to the base case. Additionally savings of 100.0%, 18.3%, and 4.0% are achieved in terms of stripper duty, compressor duty in CO2 compression and CO2 liquefaction, respectively.